> This seems to be an explanation of why a finalizer might run later than expected (or not run at all). But his paste shows that it runs *earlier* than what he expected.
What he said. > 64-bit GHC on OS X gives me this: > > ... > > However, it's a different story when `-O2` is specified: > > ... You're right. I was compiling with cabal and had -O turned on without knowing it. So this looks like an optimization bug? Mike Craig On Thu, Feb 16, 2012 at 3:55 PM, Austin Seipp <mad....@gmail.com> wrote: > 64-bit GHC on OS X gives me this: > > $ ghc -fforce-recomp -threaded finalizer > [1 of 1] Compiling Main ( finalizer.hs, finalizer.o ) > Linking finalizer ... > $ ./finalizer > waiting ... > done! > waiting ... > running finalizer > done! > > However, it's a different story when `-O2` is specified: > > $ ghc -O2 -fforce-recomp -threaded finalizer > [1 of 1] Compiling Main ( finalizer.hs, finalizer.o ) > Linking finalizer ... > $ ./finalizer > waiting ... > running finalizer > done! > waiting ... > done! > > This smells like a bug. The stranger thing is that the GC will run the > finalizer, but it doesn't reclaim the object? I'd think `readIORef` > going after an invalidated pointer the GC reclaimed would almost > certainly crash. > > On Thu, Feb 16, 2012 at 2:04 PM, Michael Craig <mks...@gmail.com> wrote: > > When I read the docs for System.Mem.Weak, it all seems to make sense. But > > then this code doesn't run as I expect it to when I turn on > > -threaded: http://hpaste.org/63832 (Expected/actual output are listed > in the > > paste.) > > > > I've tried this on 7.4.1 and 7.0.4 with the same results. Can someone > > enlighten me? > > > > Cheers, > > Mike Craig > > > > > > _______________________________________________ > > Glasgow-haskell-users mailing list > > Glasgow-haskell-users@haskell.org > > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users > > > > > > -- > Regards, > Austin >
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